#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
int main()
{
  int a = 3;
  int b = 0;
  printf("a=%d,b=%d",a,b);
  a^=b;
  b^=a;
  a^=b;
printf("a=%d,b=%d",a,b);
 return 0;
}